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🟡 Moderate
Dense Fog Advisory
Pocahontas; Humboldt; Wright; Franklin; Butler; Bremer; Sac; Calhoun; Webster; Hamilton; Hardin; Grundy; Black Hawk; Crawford; Carroll; Greene; Boone; Story; Marshall; Tama; Jasper; Poweshiek
Dense Fog Advisory issued September 17 at 1:31AM CDT until September 17 at 10:00AM CDT by NWS Des Moines IA
Alert Description
* WHAT...Visibility less than one half mile in dense fog. * WHERE...Portions of central and northern Iowa. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous.
Safety Instructions
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Time Information
Effective
Sep 17, 2026, 6:31 AM
Expires
Sep 17, 2026, 3:00 PM
Issued
Sep 17, 2026, 6:31 AM
Alert Details
Severity
Moderate
Urgency
Expected
Certainty
Likely
Category
Met
Issued By
NWS Des Moines IA
National Weather Service